Positive action poppet valve



5, 1939 H. A. SLATER ET AL POSITIVE ACTION POPFET VALVE Filed March 1, 1937 ji a rve .A., SZalez;

ATTORNEYS Patented Aug. 15, 1939 PATENT orries POSITIVE ACTION POPPET VALVE Harvey A. Slater and Eernerd R. Tarrant, Butte, Mont.

Application March 1, 1937, Serial No. 128,552

2 Claims.

This invention relates to valve operating mechanisms for poppet valves of internal combustion engines and has for the primary object the provision of a device of this character which is 5 easily adapted to engines using poppet valves for increasing emcie-ncy and speed of the engine with V a decrease in consumption of fuel.

With these and other objects in view, this in.-

vention consists in certain novel features of con- 10 struction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of our invention, reference is to be had to the following descrip- 15 tion and accompanying drawing, in which Figure 1 is a fragmentary sectional view showing our invention adapted to an engine employing a poppet valve.

Figure 2 is an enlarged fragmentary sectional 20 view showing a spring connecting the poppet valve with its valve lifter.

Figure 3 is avsectional view taken on the line 3-3 of Figure 2.

Figure 4 is a fragmentary side elevation illustrating the cam strap for connecting a valve lifter to-its cam.

Referring in detail to the drawing, the numeral I indicates a fragmentary portion of an internal combustion engine and 2 a poppet valve. It is an acknowledged fact that a poppet valve does not entirely close after the engine has been accelerated above certain speeds, consequently decreasing the efficiency of the engine and increasing the consumption of fuel. These disadvantages 3 are overcome by the adapting of our invention to the engine and thepoppet valve. The valve stem is screw threaded, as shown at 3, and has threaded thereon nuts 4 between which are positioned washers 5. A valve lifter 6 has a screw threaded portion 1 on which are threaded nuts 8 and positionedbetween the nuts 8 are washers.

9. Hinged to the valve lifter 6 is an eccentric strap I composed of detachable sections. The strap l0 engages with an eccentric II of the 45 eccentric shaft I2. A coil spring 13 of a selected strength is connected to the stem of the poppet valve and to the valve lifter 6 by having the ends of the spring clamped between the washers and 9. The washers are held in gripping posi- 50 tion by the nuts 4 and 8 and also by adjusting the nuts. either upon the stem of the valve or upon the valve lifter the tension of the spring may be varied. The valve lifter engages the valve stem, as shown in Figures 1 and 2. Due tothe connecting of the spring to the poppet valve and the valve lifter and the connecting of the valve lifter to the eccentric, as shown and described,

a positive closing action will be had upon the valve assuring proper and positive seating of the valve to prevent waste of fuel and loss of compression in the engine thereby increasing the eiiiciency of the engine and reducing the consumption of fuel. As the eccentric moves towards its lower- 5 most positions, considerable tension is placed on the spring is which assures positive seating of the valve with a quick action.

While our invention has been shown and described as being adaptable to engines of the L head type it is to be understood that our invention can also be readily adapted to push rods of valve mechanisms employed in engines of the valve-in-the-head type by simply connecting one end of the coil spring to the push rod in a man- 15 ner similar to that of connecting said spring to the stem of a poppet valve and as shown in Figure 1.

What is claimed is:

1. An adjusting means for a positive action poppet valve mechanism comprising a screw. threaded valve stem, a screw-threaded positively actuated valve lifter, and spring means resiliently and adjustably connecting said stem and lifter in aligned position, said last-mentioned means comprising a spring having ends formedinto eyes, said eyes surrounding the threaded portions of the stem and lifter, pairs of washers receiving the eyes of the spring therebetween and mounted on said threaded stem and threaded lifter for adjustment endwise thereof, and pairs of nuts threaded on said stem and lifter forcing the pairs of washers to tightly grip the eyes of the spring to normally retain the washers and said stem and lifter against relative movement and permit said pairs of washers to be manually adjusted for increasing and decreasing the tension of the spring.

2. An adjusting means for a positive action poppet valve mechanism comprising a screwthreaded valve stem, at screw-threaded positively actuated valve lifter, and coil spring means resiliently and adjustably connecting said stem and lifter, said last-mentioned means comprising a spring having ends formed into eyes, said eyes surrounding the threaded portions of the stem and lifter, pairs of washers receiving the eyes of the spring therebetween and mounted on said threaded stem and threaded lifter for adjustment endwise thereof, and pairs of nuts threaded on said stem and lifter forcing the pairs of washers to tightly grip the eyes of the spring to normally retain the washers and said stem and lifter against relative movement and permit said pairs of washers to be manually adjusted for increasing and decreasing the tension of the spring.

BERNERD R. TARRANT. HARVEY A. SLATER. 

